If Cavill has to be in the equation, then this looks to be good best of both worlds scenario.
But we're also looking at delaying the new Supes for at least 6-7 years while Battinson takes off. Rob could potentially be on his way out by then. We're in a very unique position that a Batman helmer and (potentially) a Superman, are great friends and creative partners. Even if it's just isolated to Bats and Supes, that's a wonderful playground to be in. I'd rather they get to work on this new direction now.